EHF

Question 1

• Nomenclature of EHF terminal?

Answer 1

USC-38(v)2

Question 2

• List 7 things required to bring up EHF?

Answer 2

Timing, Crypto, Navigation, Ephemeris Data, Adaptation Data, Dry Air, Chilled Water

Question 3

• What should the status of the HPA display when in IDLE?

Answer 3

From HPA Dummy Load means no TX.

Question 4

• What are the black keys and their classification?

Answer 4

Unclas ; TAC-1, Cover, & Downlink.

Question 5

• What is TAC 1 used for?

Answer 5

Allows access to satellite beams. Cover? Privilege level used to control satellite and communication functions . Downlink? Common to all satellite beams

Question 6

• What is the red unique key used for?

Answer 6

Encrypts the black keys

Question 7

• What are the red operational keys?

Answer 7

EHF SKL KEYS

Question 8

• Describe the differences between loading black keys and red operational keys?

Answer 8

Red operational keys are already encrypted , Black keys need the RED UNIQUE to encrypt them.

Question 9

• What navigational inputs are required?

Answer 9

Lat/Long: Manually entered, Heading: SINS(Shipboard Internal Navigation System)(WSN-7),Speed: Manually entered ,Pitch/Roll: SINS (WSN-7)

Question 10

• What is A-data?

Answer 10

Adaptation Data

Question 11

 What is System-data?

Answer 11

Defines which satellites are out there and which ones you can join.

Question 12

 What is Terminal-data?

Answer 12

Gives ships specific Terminal ID (BHR is 2489) and defines block zones for the ship.

Question 13

• What is E-data?

Answer 13

Satellite position and velocity, Good for 42 days on MIL*, Will update on its own if the satellite is acquired, May still acquire if stale but may take longer.

Question 14

• How do you format A-data and E-data?

Answer 14

Delete all Misc. letters until it looks like EHF Handbook.

Question 15

• What type of cooling is used for EHF?

Answer 15

Chilled Water

Question 16

• List EHF antenna and locations?

Answer 16

Two AS-4294; On top PRIFLY, On SPN-35 platform.

Question 17

• How many gyros per antenna?

Answer 17

2

Question 18

• How many LDR ports are there? MDR?

Answer 18

There are 12 Ports for LDR. 4 Prim. W/max 2400bps, 4 Sec. W/max 300bps, 4 RCV ports W/max 2400bps. There are 16 ports for MDR.

Question 19

• What beam is used for LDR?

Answer 19

Uses Earth Coverage beam W/ a 17.5˚ wide beam which covers 4000 NM; Which provides Network & PTP W/ Data and Voice.

Question 20

• What is required before you can acquire MDR?

Answer 20

LDR

Question 21

• What type of MDR beam would we use?

Answer 21

Uses Nuller Spot Beam & Distributed User Coverage Antenna. NSB is 1˚ wide (400 NM), and DUCA is 1˚ wide (400 NM). Services Provided are; Dual Simplex for IP services, Voice Nets or PTP calls at 2400 bps, TIP (TMDA Interface Processor) for IP services.

Question 22

• What does XMT/RCV; XMT/RCV mean?

Answer 22

We are up on LDR/MDR.

Question 23

• List CCI for EHF?

Answer 23

KYV-5, KIV-7M, KGV-11.

Question 24

• What does the KYV-5 limit the data rate to?

Answer 24

2400.

Question 25

• What are MDR ports 15 and 16 used for?

Answer 25

15 = DSVT, 16 =T1…These are both not used by us.

Question 26

• What does DUCA stand for? NSB?

Answer 26

Distributed User Coverage Antenna & Nueller Spot Beam

Question 27

• Where can you find a list of all Terminal ID’s?

Answer 27

EHF Handbook

Question 28

• What type of multiplexing does EHF use?

Answer 28

Time Division Multiple Access

Question 29

• How many LDR timeslots are there?

Answer 29

7

Question 30

MDR?

Answer 30

237

Question 31

• For an LDR voice net, what do you need to know about timeslots for all users on the net to communicate?

Answer 31

Can’t let it auto select if ARG wants to communicate, If you use timeslot 7, you will be allocating all the data to one circuit.

Question 32

• What is an ESP and what information is on it?

Answer 32

EHF Service Plan

Question 33

• What is ATIP?

Answer 33

Advanced TDMA Interface Process

Question 34

• What is special about the data rate for CT TIP?

Answer 34

When more than one person is on the net, the bandwidth is allocated equally.